Stones scraped Donald Blakeslee’s knees, but he was used to that. Using his mud-covered gloves, he picked the pebbles and tossed them away from the excavation area. The site was full of tools like shovels, brushes, and spoons. Both he and his crew had spent weeks sifting through the ground in Kansas. They kept searching for something interesting to research. But then he winced at an unusually sharp pain. Except for this time, a stone wasn’t to blame.